The role of structure defects in the deformation of anthracite and their influence on the macromolecular structure

Han, Young‐Kyu; Wang, Jin; Dong, Yijing; Hou, Quanlin; Pan, Jienan

doi:10.1016/j.fuel.2017.05.085

Cited by 61 publications

(71 citation statements)

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“…Raman spectroscopy is one of the most widely used tools to determine the microstructural ordering of the carbonaceous matter (Baysal et al, 2016;Beyssac et al, 2002aBeyssac et al, , b, 2003aCuesta et al, 1998;González et al, 2002González et al, , 2003González et al, , 2004Han et al, 2017;Jawhari et al, 1995;Kelemen and Fang, 2001;Kwiecińska et al, 2010;Marques et al, 2009;Pasteris and Wopenka, 1991;Sadezky et al, 2005;Suárez-Ruiz and García, 2007;Tuinstra and Koenig, 1970;Wopenka and Pasteris, 1993;Xueqiu et al, 2017). It can reveal the microstructural imperfections induced by the tectonic deformation (Han et al, 2017) as well as the metamorphic temperature of the carbonaceous materials from the relative area ratios of the defect band 1 (D 1 ) and graphitic band (G) (Beyssac et al, 2002a). Therefore, the detailed documentation of the optical and the microstructural transformations of the anthracite samples in response to the Himalayan tectonic activities through the aid of petrographic analysis (compositional and RIS characterization), and Raman spectroscopy defines the novelty of this study in front of the world science repute.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…However, the detailed optical analysis thorough Reflectance Indicating Surface characterization as well as the Raman spectroscopic characteristics of these coal samples promoted by the Himalayan orogeny have been under cover hitherto. The anthracite and the graphite from other basins in the world have been, widely, studied from detailed petrographic, and microstructural points of view (Han et al, 2017;Kwiecińska et al, 2010;Marques et al, 2009;Okolo et al, 2015;Rodrigues et al, 2011aRodrigues et al, , b, 2013Xueqiu et al, 2017, among others) and these parameters have also been correlated and used in the investigation for the experimental production of graphite like particles under laboratory environment (González et al, 2004;Pusz et al, 2003;Rodrigues et al, 2011a, b). But these coal samples from the Rangit duplex of Sikkim Himalayan fold-thrust belts (FTBs) have not been explored until now from these aspects.…”

Section: Introductionmentioning

confidence: 99%

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Petrographic and Raman spectroscopic characterization of coal from Himalayan fold-thrust belts of Sikkim, India

Ghosh

Rodrigues

Varma

et al. 2018

International Journal of Coal Geology

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The present study focuses on the investigation of the optical anisotropy, optical sign, textural heterogeneity and deformational features of the maceral grains along with the Raman spectral characteristics of the seven coal samples collected from the Himalayan fold-thrust belts of Sikkim State, India. The coal samples were extremely fragile and pulverized due to the intense tectonic deformation. The maceral composition revealed the dominance of semifusinite over collotelinite grains. The calculated maximum vitrinite reflectance (5.94 -8.66 %) and mean random reflectance (4.11 -5.36 %) suggest anthracite A rank of the coal samples following ISO 11760:2005. The proximity of the intermediate reflectance axis value (R INT ) to maximum reflectance axis value (R MAX ) as well as the range of Reflectance Indicating Surface (RIS) style (R st ) values (-9.98 to -19.37) indicates the biaxial negative optical texture of the vitrinite grains. The augmented bireflectance values due to enhancement of the R MAX associated with strong decline in R MIN may suggest the commencement of pregraphitization. In addition, the strong linear correlation (r = 0.94) of the RIS-anisotropy (R am ) parameter with the bireflectance values may imply the role of tectonic stress on the optical transformations of the samples. The range of the peak temperature (334.94 -369.01 ℃) calculated from mean random vitrinite reflectance may suggest the effect of thermo-stress coupling on the metamorphism of these coal samples. Microlithotype study combined with deformational aspects of macerals shows the presence of "deformed", "sheared" and "smashed" grains within each sample, which may, additionally, document the tectonic stress influence on the coal particles. Moreover, relatively, larger area of 'defect band 1 (D 1 )' than that of 'graphitic band (G)' along with the broad G band in the first order Raman spectra may indicate the considerable presence of structural dislocations and aromatic compounds with disordered bond angle within the microstructure induced by the tectonic deformation. The lowest intensity of the 'defect band 4 (D 4 )' may suggest the preferential removal of aliphatic compounds from the samples in response to the tectonic stress degradation. In addition, the relative area ratio calculated from the D 1 and the G bands (AD 1 /(AD 1 +AG)) may indicate that the studied anthracite samples would have attained the metamorphic temperature ranging from 325.12 -387.89 ℃.

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Section: Accepted Manuscriptmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Petrographic and Raman spectroscopic characterization of coal from Himalayan fold-thrust belts of Sikkim, India

Ghosh

Rodrigues

Varma

et al. 2018

International Journal of Coal Geology

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“…Recent Han et al [75] showed that anthracite was deformed by the generation of structure defects at the atomistic scale. Latest calculations [76] further indicated that the existence of structure defects could lower the energy barrier of carbon monoxide formation under stress by increasing the initial reactant energy and changing the molecule geometry. Therefore, the mechanochemical effects of stress, including the direct bond breakage and the influence of deformation on the energy barrier, may account for the stress impacts on the chemical structure of coals.…”

Section: How Stress Work On the Chemical Structure Of Coalsmentioning

confidence: 99%

The impacts of stress on the chemical structure of coals: a mini-review based on the recent development of mechanochemistry

et al. 2017

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“… 19 However, the main groups of TDCs have mainly concentrated on the nanopores under the effects from nappe, 29 − 31 monocline, 32 , 33 and fault. 34 , 35 The structure and heterogeneity of nanopores for TDCs formed in the syncline-deformed zone have been rarely reported to date. On the other hand, previous publications have mainly investigated the low and high ranks.…”

Section: Introductionmentioning

confidence: 99%

Structural and Fractal Characterizations of Nanopores in Middle-Rank Tectonically Deformed Coals – Case Study in Panguan Syncline

Wen

Jiang

et al. 2020

ACS Omega

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The reservoir properties of tectonically deformed coals (TDCs) differ significantly compared with their neighboring primary coals which are also known as unaltered or underformed coals. However, the heterogeneity of nanopores in TDCs under the syncline control has been seldom reported, and also the middle-rank level was minimally investigated to date. Thus, in this paper, the structures and multiscale fractal characteristics of nanopores in middle-rank TDCs under the controlling effect from Panguan Syncline were investigated via high-pressure mercury injection (HPMI), low-pressure CO 2 /N 2 adsorption (LPCO 2 /N 2 GA), and fractal theory. The results show that both the pore volume (PV) and specific surface area (SSA) of macropores increase significantly in the stage of cataclastic–schistose coal. For ductile deformed coals, the PV increases, while the SSA remains stable. The SSA of mesopores increases slightly in the brittle deformation stage, but significantly in the ductile deformation stage. For micropores, both the PV and SSA for TDCs are significantly higher than primary coals. Moreover, the ductile deformation has a more significant promotion effect for the microporous PV and SSA than the brittle deformation. The fractal dimension of the adsorption pore (induced from the Sierpinski model) increases; however, that of seepage pores (Sierpinski model) decreases with the enhancement of tectonic deformation. The fractal dimension for mesoporous (induced from the FHH model, Frenkel–Halsey–Hill) at 2–6 nm keeps stable in the stage of cataclastic–schistose coal but significantly increases in the ductile deformation stage. For mesopores of 6–100 nm, their heterogeneities were also enhanced in the ductile deformation stage. The fractal dimension of 0.3–0.6 nm micropores is close to 3 and changes slightly with the enhancement of tectonic deformation, indicating that the heterogeneity of smaller micropores is stronger than that of larger micropores. The results are of broad interest for CBM exploration and gas outburst prediction.

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The role of structure defects in the deformation of anthracite and their influence on the macromolecular structure

Cited by 61 publications

References 60 publications

Petrographic and Raman spectroscopic characterization of coal from Himalayan fold-thrust belts of Sikkim, India

Petrographic and Raman spectroscopic characterization of coal from Himalayan fold-thrust belts of Sikkim, India

The impacts of stress on the chemical structure of coals: a mini-review based on the recent development of mechanochemistry

Structural and Fractal Characterizations of Nanopores in Middle-Rank Tectonically Deformed Coals – Case Study in Panguan Syncline

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